package tests;

import java.math.BigDecimal;
import java.util.Scanner;

public class test14 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            BigDecimal a = sc.nextBigDecimal();
            BigDecimal b = sc.nextBigDecimal();
            BigDecimal c = sc.nextBigDecimal();
            if(a.add(b).compareTo(c)>0&&a.add(c).compareTo(b)>0&&b.add(c).compareTo(a)>0){
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }
        }
        return;
    }
}
